Virtually all of harmonic patterns shown on TV don't use the techniques articulated by Carney. It's necessary to qualify the AB=CDx relationship beyond the simple 5-pointed tool provided by TV.

The following chart uses the the full suite of techniques. We see a neat, fully-qualified Gartley pattern at a major support level . I've identified the PRZ lines in orange and annotated each on the sides.

Note that the operative word in PRZ is POTENTIAL.

I personally don't trust harmonics, but this one is really clean and tempting..

Comment:
It's worth noting, for learning and full qualification, that the "X" position was the point at which the previous wave terminated (and new wave began). It's also the recent support level.